Effect of the number of substituents on the behavior of modified electrodes with cobalt porphyrins substituted with a different numbers of bis(methoxyphenyl) groups toward the oxidation of sulfite

  1. W CHEUQUEPÁN 1
  2. D VILLAGRA 2
  3. M.I AZÓCAR 1
  4. G RAMÍREZ 3
  5. Y.Y CHEN 1
  6. B MATSUHIRO 1
  7. L MENDOZA 1
  8. M ISAACS 4
  9. M.J AGUIRRE 1
  1. 1 Universidad de Santiago de Chile Facultad de Química y Biología Departamento de Química de Los Materiales
  2. 2 Universidad de Tarapacá Facultad de Ciencias Departamento de Química
  3. 3 Pontificia Universidad Católica de Chile Facultad de Química Departamento de Química Inorgánica
  4. 4 Pontificia Universidad Católica de Chile Facultad de Ciencias Departamento de Química
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Revista:
Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química)

Año de publicación: 2010

Volumen: 55

Número: 2

Páginas: 253-256

Tipo: Artículo

DOI: 10.4067/S0717-97072010000200024 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Resumen

In this study, we compared four glassy carbon electrodes modified with adsorbed porphyrins of cobalt containing one, two, three, or four bis(methoxyphenyl) groups as substituents of the ligand. The aim of this work was to determine the effect of these donating groups on the electrocatalyst behavior of the modified electrodes for the reduction or oxidation of sulfite in water or in mixtures of 12% ethanol in water (v/v) at different pHs. The results showed that the modified electrodes are not catalytic toward the electro-reduction of sulfite in the whole range of pH studied (2-12). However, all the electrodes showed a catalytic toward the oxidation of sulfite at basic pHs. We found that the best catalytic system was the four-substituted porphyrin modified electrode at pH 9.8. This system performed well as an amperometric sensor for sulfite in ethanol-water mixtures and in aqueous solutions at the same pH. When the calibration curve was carried out by cyclic voltammetry, a detection limit of 0.10 mg L-1 for the four-substituted cobalt porphyrin modified electrode in water and in ethanol-water mixtures was found.

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